Kameo, K., and T. Sato (2000), Biogeography of Neogene calcareous nannofossils in the Caribbean and the eastern equatorial Pacific–floral response to the emergence of the Isthmus of Panama, Mar. Micropaleontol., 39, 201–218.

Niebler, H. S., H. W. Hubberten, and R. Gersonde (1999), Oxygen isotope values of planktic foraminifera: A tool for the reconstruction of surface water stratification, in Use of Proxies in Paleoceanography, edited by G. Fischer, and G. Wefer, pp. 165–189, Springer, New York.